In this critically-acclaimed space isolation drama, Sam Bell is a worker for Lunar Industries who is nearing the end of a three-year contract to mine the moon's surface for the precious gas Helium 3, the solution to Earth's energy crisis. As he approaches his return to Earth, Sam reflects on the lessons he has learned during his prolonged isolation and looks forward to his reunion with his wife and young daughter. But a fortnight before his departure he starts seeing and hearing strange things that lead him to suspect that his employers intend to replace him in a far more sinister way than he imagined. Sam's only companion, a small robotic computer called Gerty.